Ace a space aged human works for the galactic federation's black watch squad hence the black armor.
the armor is insulated from heat and cold but doesn't help in lava or magma. his weapon is a sub species of X-parasite instead of melting it's host from the inside out it increases it's host's regeneration, and strength, it also allows it's host to become gelatinous incase of very tight spaces. his rival is Samus Aran due to metroids and x-parasites being natural enemies.